sodium cyanide

A salt (NaCN), usually prepared by reacting
methane with hydrogen cyanide, followed by
neutralization with sodium hydroxide, or by
passing carbon monoxide and ammonia over finely
divided sodium carbonate at 600 to 650° C.
It has been used to some extent as a (powerful)
sharpening agent in lime liquors; however, its
extremely toxic nature makes it dangerous to use.
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